Gear wheel



Nov. 14, 1939. I THOMPSON 2,179,967

GEAR WHEEL Filed April 22, 1958 INVENTOR,

' am R, m RM, 73mg ATTORNEYS.

Patented Nov. 14, 1939 I UNITEDSTATES PATENT OFFICE GEAR WHEEL Albert R. Thompson, Los Gatos, Califi, assignor to Food Machinery Corporation, San Jose, Calif., a corporation of Delaware Application April 22, 1938, Serial No. 203,532

1 Claim. (Cl. 74-460) The present invention relates to gear wheels formed, a tooth reinforcing member 6 is inserted with reinforced teeth, and has for its principal in each tooth recess 1 of said mold. In the parobject the production of a gear whose teeth or ticular structure herein shown, the reinforcing portions thereof can be formed of a different mamember consists of a flat strip whosewidth coterial from the body of the gear. incides with the width of the tooth face of the 5 A gear made in conformity with the present gear, and which is bent to the form of an indiinvention may have a body of some cheap and vidual tooth, as shown in Fig. 4. The ends of easily worked material such as cast iron, and said reinforcing member extend inwardlya short teeth formed wholly or in part of a harder madistance beyond the base of the tooth, as S own terial more resistant to wear and corrosion, such at 8 in Figs. 1 and 2, and said ends may be either 10 as stainless steel. The proportions of the body straight, as in Fig. 2, or bent laterally, as shown and tooth reinforcing materials, and the process at 8' in Fig. 3. of manufacture, are such that a gear having After the reinforcing members 6 have been superior wearing qualities can be made cheaply. placed in the tooth recesses of the mold 5, the

The particular embodiment of the invention y 9 0f the gear is Cast. y being p red into 15 erein described and illustrated, by way of exthe mold in .the usual manner. The body te al ample only, is designed as a conveyer disk for flows into the reinforcing members 6 to form use in exhaust boxes of the type shown in my tooth bodies or cores l0 therewithin, and embeds United States Patent No. 1,521,407, issued Decemhe n s 8 or 8', which serve as anchors to assist her 30, 1924. It is to be understood, however, the natural bond between the two materials in 20 that the invention is not limited or restricted to h l in the einf r n m m n pl ce. such use, nor to the materials described herein When the gear is removed from the mold, it by way of example, but may be embodied in gears has each tooth covered with a layer of reinforcing made of any other suitable materials and designed material Which s fi y ded and locked in for any use. It is also to be understood that pl and w ch v rs he n ir wearing sur- 25 changes may be made, within the scope of the e of the tooth The gear y e fi ed, f claim hereto appended, in the form and. condesired; y y Suitable machining grinding struction of the several parts, and in the several p s.

steps of the process of manufacture, as herein If the y is made of Cast ron and the reinshown and described. forcing members of some hard alloy such as stain- 30 Reference will be made to the accompanying l Steel. a r is pr vided Whose hub and drawing, in which sides can be easily turned in a lathe, and whose Fig, 1 is a transverse ectio of a gear h l teeth have hard surfaces resistant to wear and embodying a preferred form of the invention. corrosion. Such a gear is especially advantageous Fig. 2 is a broken side view, on alarger scale, in an exhaust box of the type previously referred 35 of a portion of the gear as it appears before to, in which corrosion due to slightly acidulated being removed from the mold in which it is cast, steam causes rapid wear of ordinary iron teeth.

the mold being shown in section. I claim:

Fig. 3 is a broken side view of a portion of a A gear wheel comprising a body of cast metal gear showing a modified form of reinforcing having integral gear teeth thereon, each of said 40 member. gear teeth being provided with an individually Fig, 4 is a perspective View of one of the tooth formed facing strip of wear resistant sheet metal reinforcing members. closely fitting the contour of the tooth, said fac- In the drawing, the reference numeral 5, shown s s ips avi their inner ds ast tly in Fig. 2, designates a mold in which the gear is ntO Sa d g a y whereby y are firmly 45 cast. The mold may be formed in any usual mancured in place. ner of any suitable material. After the mold is ALBERT R. THOMPSON. 

